198694497578 has 16 divisors (see below), whose sum is σ = 305345637576. Its totient is φ = 96913167360.

The previous prime is 198694497541. The next prime is 198694497601. The reversal of 198694497578 is 875794496891.

It is a happy number.

198694497578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 131285202889 + 67409294689 = 362333^2 + 259633^2 .

It is a junction number, because it is equal to n+sod(n) for n = 198694497499 and 198694497508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616250 + ... + 881562.

Almost surely, 2^198694497578 is an apocalyptic number.

198694497578 is a deficient number, since it is larger than the sum of its proper divisors (106651139998).

198694497578 is a wasteful number, since it uses less digits than its factorization.

198694497578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274489.

The product of its digits is 1097349120, while the sum is 77.

The spelling of 198694497578 in words is "one hundred ninety-eight billion, six hundred ninety-four million, four hundred ninety-seven thousand, five hundred seventy-eight".